Nearly half of all Americans will be obese by 2030, researchers reported at the Center for Disease Control and Prevention’s Weight of the Nation conference in Washington earlier this month. 42 percent of us are projected to be obese, placing a huge strain on our already compromised health care system. Brian Fung at The Atlantic points out that the healthcare costs of obesity — $550 billion over the next two decades — is more than the U.S. Department of Defense asked for in its fiscal year 2013 budget.

There are a lot of reasons — chemical, psychological, environmental — …